Link G4X WRXLink (V10) – WRX107X

Link G4X WRXLink (07) WRX107X PlugIn ECU

Easy to install. Affordable. Reliable.
The Link G4X PlugIn ECU transforms your WRX into a precision-tuned performance machine.
Enjoy the latest in engine management technology — fitted directly into your OEM enclosure with no wiring loom modifications required.

Choose the Right Model – Pin Check Required!

The fastest and most reliable way to determine which ECU you need is to check pins A1–A3 on your OEM connector:

• If pins A1–A3 have wires → WRX104X

• If pins A1–A3 are empty → WRX107X (this listing – part 225-4000)

⚠️ Some late-2006 cars require the WRX107X, so this check is essential.

Vehicle Compatibility

• Designed for WRX V10 EJ25 (2.5L) 2004–2007

• Manual transmission only

• Suits GD/GG chassis with electronic throttle

• Not suitable for GR/GH/GE/GV hatchbacks or 3rd-generation WRX

Model breakdown:

• WRX104X → Mostly covers 2004–2006

• WRX107X → Covers 2007 and some late-2006

Why Choose Link G4X?

• Factory fit, motorsport power – fits inside the OEM case while offering world-class tuning flexibility

• Plug-and-play installation – no loom alterations for supported models

• Confidence & reliability – trusted by tuners worldwide

• Full feature set – advanced boost control, antilag, launch, knock protection & more

G4X PlugIn Key Features (where applicable)

• Up to 6D fuel and ignition mapping

• Precision closed-loop cam control (four cam, independent control)

• Sequential fuel delivery

• Digital triggering – all OEM patterns

• OEM idle hardware supported

• 5D boost control with three switchable tables

• Motorsport features – antilag, launch, flat shift

• Continuous barometric correction (on board)

• CAN port

• QuickTune – automated fuel tuning

• Individual cylinder correction

• USB tuning cable included

• Stats recording into on-board memory

• Gear compensations for spark, boost, and fuel

• Real-time selectable dual fuel, ignition, and boost maps

• Sync and crank sensors can be Hall effect, variable reluctance, or optical combinations

• Boost control referenced to gear, speed, or throttle position

• 512 MB data logging memory

• Staged injection

• Knock control with “windowing”

Expansion Connector Details

2004–2006 ECU

Expansion connector inputs/outputs provided:

• Blank – AN Volt 11

• An Temp 4 – Temperature sensor input

• Blank – No function

• Blank – AN Volt 12

• Blank – No function

• Blank – No function

• +5 V Out – Low-current +5 V supply

• GND – Sensor ground only

2006–2007 ECU

Expansion connector inputs/outputs provided:

• Aux 11 – Auxiliary Output

• An Temp 4 – Temperature sensor input

• Aux 12 – Auxiliary Output

• Volt 11 – Analog 0–5 V input

• Aux 13 – Auxiliary Output

• DI 11 – Digital Input

• +5 V Out – Low-current +5 V supply

• GND – Sensor ground only